When looking at a high brightness LCD screen, everyone will pay attention to a very important parameter, which is brightness, and a very important factor affecting brightness is aperture ratio. Simply put, aperture ratio is the proportion of effective areas that light can pass through. Today, the outdoor high brightness screen manufacturer's editor will talk to you about what is the opening rate of LCD screens?
When light is emitted through the backlight panel, not all light can pass through the panel, such as the signal wiring used for LCD driver chips, TFT itself, and storage capacitors. In addition to incomplete light transmission, the light passing through these areas is not controlled by voltage and cannot display the correct grayscale. Therefore, they need to be shielded to avoid interfering with the correct brightness of other light transmission areas.
So the effective transparent area is only the area shown on the right in the above picture. The ratio of this effective transparent area to the total area is called the aperture ratio. The light emitted from the backlight panel will pass through the polarizer, glass, liquid crystal, color filter, and so on in sequence. Assuming that the penetration rate of each component is as follows:
Polarizing plate: 50% (because it only allows one-way light waves to pass through)
Glass: 95% (needs to calculate the top and bottom two pieces)
LCD: 95%
Opening rate: 50% (only half of the effective transparent area)
Color filter: 27% (assuming that the material itself has a penetration rate of 80%, as the filter itself is coated with color, it can only allow light waves of that color to pass through, leaving only one-third of the brightness. In total, it can only pass through 80% * 33%=27%)
Based on the above penetration rate, only 6% of the light is left from the backlight panel, which is really pitiful. This is also why in the design of TFT LCD, it is important to increase the aperture ratio as much as possible. By increasing the aperture ratio, the brightness can be increased, and the brightness of the backlight board does not need to be so high, which can save power consumption and expenses.
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